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When to plant crocuses in Okayama: 15 November – end of December

In Okayama, crocus: plant from 15 November to the end of December. For planting stock, the places nearby include 瀬戸内庭園資材 (garden centre, 12 km) and 清光園芸 (garden centre, 12 km); addresses and opening hours are below.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The average daily temperature here stays above 0 °C all winter, and at least three months average 7 °C or less: our rule of thumb for the winter cold spring bulbs need. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS.

Crocus in Okayama: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 0.3 °C.

Planting15 November – end of December
First autumn frost15 December
Coldest nightsJanuary, 0.3 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:22 on 15 November
Daylight at the winter solstice9:50

The same dates in Okayama hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Okayama: depth, winter cold, pests and pets

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (RHS).

In Okayama the average daily temperature stays at 10 °C or lower for about 16 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 15–17 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus in nearby cities

Around Okayama, Hiroshima is 20 days earlier and Fukuoka 6 days later.

CityDistanceDateDifference
Hiroshima138 km26 October – end of December20 days earlier
Osaka145 km17 November – end of December2 days later
Kyoto174 km7 November – end of December8 days earlier
Nagoya278 km10 November – end of December5 days earlier
Fukuoka345 kmby 21 November6 days later
Hamamatsu348 kmby 18 November3 days later

Where to buy crocus for planting in Okayama

Planting stock goes into the ground from 15 November to the end of December; buy it before that. Within 15 km of Okayama OpenStreetMap lists 8 garden centres, 5 farm-supply shops, 3 markets and 19 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Okayama?

In Okayama, crocus: plant from 15 November to the end of December. Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

When is the last spring frost in Okayama?

Last spring frost around 20 March, first autumn frost around 15 December.

Other crops in Okayama, with their dates